For those us you running the trailing arm suspension (lots of us I'll bet) here is a tip. I may be late to the table with this one but check the pics below to see what I found while cleaning/prepping my trailing arms for paint
. I found cracks beginning at the bosses for the u bolts that ran nearly 10" top and bottom. You can also see what I did to repair/rebuild them. This truck was over worked for years (running around on the bump stops) and I guess wasn't that surprised when I saw this. I have dropped in a new motor that I am expecting to dyno around 480hp. This has convinced me to add a rear sway bar to limit the stress on the trailing arms. I also plan to build some tubular arms next winter that will be much stronger and also correct my pinion angle. Check those trailing arms!